Airplane propeller



Sept. 20, 1932.

E. STAATS, JR

AIRPLANE PROPELLER Filed Oct. 17, 1930 Patented Sept. 20, 1932 EDWARD STA-ATS, JR., OF MERRILL, WISCONSIN AIRPLANE PRQPEIJLER Application filed October 17, 1930. Serial No. 489,406.

This invention relates to certain novel improvements in airplane propellers and has for its principal object the provision of an improved construction of this character which will be highly efficient in use and economical in manufacture.

The salient object of this invention is to provide an improved propeller construction for airplanes and, more specifically, to provide an improved propeller construction which includes a plurality of blades of different diameters so arranged that the total backward wind pressure or thrust exerted thereby materially increases the speed capable of being developed by a plane employing the invention.

Another object of the invention consists in the novel structural arrangement for mounting the propeller blades in tandem're lation.

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of parts to be hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawing, showing the preferred form of construction and in which:

Fig. 1 is an end elevational View depicting a preferred form of construction of the invention in operative position;

Fig. 2 is a side elevational View taken substantially on the line 22 in Fig. 1;

Fig. 3 is a sectional detail view taken substantially on the line 3-3 in Fig. 1;

Fig. 4 is a sectional detail view taken substantially on the line 44 in Fig. 3;

Fig. 5 is a sectional detail view taken substantially on the line 5-5 in Fig. 3; and

Fig. 6 is a view similar to Fig. 1 depicting a modified form of construction.

Referring to the drawing wherein a preferred form of construction of the invention is depicted, there is indicated at 10 the stream line nose portion of the hood of an airplane motor on which is provided a cowl 11. Within the hood 10 is a crank case generically indicated at 12 and associated with the crank case 12 in a manner well understood in the art is the power driven shaft 13.

On the shaft 13 I provide a hub 14 which is secured in position by means of a jamb nut 15 and extending in diametrically opposed relation from the hub 14 are blades 16 and 17. The blade 16 has a slightly arcuate contour so as to be convex on one side as indicated at 18 and concave on the other side thereof as indicated at 19. The blade 17 is similarly formed but oppositely arranged so that the convex side 20 thereof is opposite the convex side 18 of the blade 16, the blade 17 being concave oppositely to the blade 17 as indicated at 21. Provided in the blade 16 is a dished out portion 22 and a similar dished out portion 23 is provided in the blade 17.

There is provided forwardly of the hub 24 a hub 27 from which extends blades 28 and 29 which are similar to the blades 25 and 26 respectively but of shorter length so that the arc of travel of the blades 28 and 29 is of smaller diameter than the arc of travel of the blades 25 and 26.

There are provided in the hub 14 recesses 30 and 31 and recesses 32 and 33 are provided in the hub 27. Extending through aligned openings in the hubs 14, 24, and 27 is a bolt 34, the head 34' of which'is seated in the recess 32 while the threaded end portion of the bolt 34 has provided thereon a nut 35 that is disposed in the recess 33. Other aligned openings are provided in the hubs 14, 24, and 27 and projecting through these openings is a bolt 36, the head 36' of which is disposed in the recess 33 while the threaded end portion of the bolt 36 carries a nut 37 that is disposed in the recess 31.

Forwardly of the hub 27 there is provided a nose portion 38 which is rabbetted as at 39 and 40 and extending through this nose portion 38 from the recesses 39 and 40 respectively are bolts such as 41 and 42 which secure the nose portion to the hub 27.

It will be apparent, therefore, from the foregoing description of my invention that T have provided a novel and improved propellerconstruction for airplanes embodying a plurality of propeller blades arranged in tandem so that when in operation these blades materially increase the driving thrust and speed capacity of the airplane.

In Fig. 6 there is depicted a modified form of construction in which there is provided a construction similar to that of Figs. 1 to 5 except that there is provided-between the nose portion 43, which is similar to the nose portion 38, and the hood 10 only two sets of propeller blades. Disposed between the nose 43 and the hood 10 (the hood 10 not being shown in Fig. 6) is a hub 44 from which project blades 45 and 46 and rearwardly of the hub 44 is a hub 47 from which project blades 48 and 49, the hubs 44 and 47 being similar to the hereinbefore described hubs while the blades 45 and 46, and 48 and 49 are similar to the hereinbefore described propeller blades.

While I have illustrated and described the preferred form of construction ior carrying my invention into efi'ect, this is capable of variation and modification, without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended' claim.

Having thus described my invention what I claim as new and desire to protect by Letters Patent is:

' airplane propeller structure comprising a shaft, a plurality .of series of propeller blades arranged in tandem relation, each series having its blades increasing in length over the length of the blades of the preceding series, the blades of one end series including a hub, the others of said series of blades including hubs, said hubs having aligned aperturesextending therethrough, and nut-bearing bolts extended through said apertures to secure the second named hubs to the firstnamed hub.

In testimony whereof I afiix my si ature.

EDWARD STAAT JR. 

